tty: Fix oops when scanning the polling list for kgdb

Costantino Leandro found a bug in tty_find_polling_driver and provided a
patch that fixed the crash but not the underlying bug. This fixes the
underlying bug where the list walk corrupts the values it is using on a
match but then reuses them if the open fails.

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 66b99a2..6c81739 100644 (file)
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -295,7 +295,7 @@ struct tty_driver *tty_find_polling_driver(char *name, int *line)
        struct tty_driver *p, *res = NULL;
        int tty_line = 0;
        int len;
-       char *str;
+       char *str, *stp;
 
        for (str = name; *str; str++)
                if ((*str >= '0' && *str <= '9') || *str == ',')
@@ -311,13 +311,14 @@ struct tty_driver *tty_find_polling_driver(char *name, int *line)
        list_for_each_entry(p, &tty_drivers, tty_drivers) {
                if (strncmp(name, p->name, len) != 0)
                        continue;
-               if (*str == ',')
-                       str++;
-               if (*str == '\0')
-                       str = NULL;
+               stp = str;
+               if (*stp == ',')
+                       stp++;
+               if (*stp == '\0')
+                       stp = NULL;
 
                if (tty_line >= 0 && tty_line <= p->num && p->ops &&
-                   p->ops->poll_init && !p->ops->poll_init(p, tty_line, str)) {
+                   p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) {
                        res = tty_driver_kref_get(p);
                        *line = tty_line;
                        break;